Helmer varben



H. vARnEN,

DRIVING BEIT. APPLICATION FILED MN. I. i918.

Patented Nov; 11, 1919.

Inventnr'r Helmer' Um." Elan.

by ALAM Att n :snag

UNITED; STATES PATENT OFFICE.-

'nELMnn VARDEN, or sTAvANGEE, NORWAY;

DRIVING-nam.

agences;

Specicati'on of `Lettera Patent.

Patented Now 11, 1919.

Application led January 7, 1.918. SerialNo. 210,701.

To all whom t may eoncemf l Be it known that I, HELMER VARDEN, citizen of Norway, residing atNymansveien 62, Stavanger, Norway, have invented a new and useful Improvement in Driving-Belts; and I do hereby declare the followin to be a full, clear, and exact description of t e same.

In belting it is highly important in many cases to enable the use of a driving pulley with a small diameter and thereby to obtain the largest possible ratio of vtransmission.

At the same time it will be advantageous to arrange the driving pulley closely adjacent to the driven pulley so. as to obtain a compact construction. However, the smaller the distance is between th'e two pulleys and the smaller the diameter of the driving pulley is, the more diflicult it will be to. obtain a reliable power transmission, partly'because the` encircling or engaging portion of the belt decreases with decreasing 'pulley distance and partly'becausethe belt must be the more exible the smaller is the diameter of tain a highlexibility of the belt.

The invention islillustrated'in the accompanying drawing, 1n which:

Figure '1 shows the driving pulley, the belt and thedriven pulley in elevation.

Iig. 2 is an end View of the same. f Fig. 3 shows on abelt, and

Fig. l shows on a larger scale a cross vsection of a steel band belt.

rIhe drivin pulley -1-v is placed closely adjacent to t eL drivenfl'iullel 2- and has asmall diameter. -Its perip ery isprovided a larger scale a portion of with uniformly distributed projections -3- which engage the correspondingly arranged holes -4- (Fig. 3) in the belt -5-, whereby the'tra-nsmission will be independent of the friction `between belt'and pulley and the diameter ofthe latter may therefore be very small.

In order to obtain a belt of a flexibility and at the same time to prevent suilicient the holes *A- from being quickly worn at their edges, the belt is composed of a plurality of thin steel bands (see Fig. 4), which are placed upon each other and are held together-by means of rivets -6- along the two longitudinal edges of the belt. These rivets are riveted in such a manner, however, that the steel bands are held only lightly pressed together. The two outer steel bands; are provided with' inclined iny Wardly-turned edges .-7- under the rivet '.heads, and all the rivet holes of all bands are so spaced that in-spite of the presence of@ the` rivets a small sliding may take place between the several bands, when the belt is bent around the pulleys -1- and --2- and said lbands will return to normal position after such bending.

Having now described my invention, what I claim as new and desire to secure by Letl ters Patent is: l

A driving belt` composed of thin relatively-slidable metal bands'placed .upon each other and each having a small relative sliding motion during bending of the belt, the bands having alined openings and the edges ofthe openings of the outer bands turned inwardly, and rivets passing through and smaller than said openings and with the heads of the?" rivets engaging the inturnedy edges of the outer bands. v In testimony. whereof, I have the subscribing witnesses.-

' HELMER VARDEN..` `Witnesses:

H. HELMIorrsnnv M oReENs Busen, JANos' Jon.'4v

l I signed-illy" name to this-specification in the'presence of 

